What Does Zero Trust Actually Mean
Zero Trust is not a product you buy — it’s an architecture philosophy. The traditional perimeter-based security model assumed that anything inside the network could be trusted. Zero Trust flips that: no user, device, or service is trusted by default, regardless of network location. Every access request must be authenticated, authorized, and continuously validated. This matters enormously in 2026, when municipal networks include remote workers, field devices, cloud services, and vendor access — all of which blur the traditional perimeter.
Step 1: Identity Is Your New Perimeter
The highest-impact, lowest-cost starting point is hardening identity. Ensure every user account has Multi-Factor Authentication enabled — no exceptions, including service accounts and admin accounts. If you’re running hybrid AD with Entra ID (Azure AD), Conditional Access policies can enforce MFA based on risk signals without additional licensing beyond your existing M365 agreement. Audit privileged accounts and eliminate standing admin access where possible — use Privileged Identity Management (PIM) if licensed.
Step 2: Device Compliance
Zero Trust requires knowing the health of the device making an access request. Microsoft Intune with Conditional Access can enforce device compliance as a condition of resource access — unmanaged or non-compliant devices get blocked or limited access. For smaller environments without Intune, ensuring all devices are domain-joined and receive GPO-managed security baselines is a foundational step.
Step 3: Network Segmentation
Municipal networks often have flat network architectures left over from simpler times. Segmenting networks by function — separating SCADA/OT systems, public Wi-Fi, administrative workstations, and servers into distinct VLANs with appropriate firewall rules — is a core Zero Trust network principle and doesn’t require expensive new hardware in most cases. Most managed switches and existing firewalls support VLAN segmentation.
Step 4: Least Privilege Access
Audit user permissions and service account rights. Most users in municipal environments have accumulated permissions over years that they no longer need. Role-based access control reviews, conducted annually, are a simple process that dramatically reduces your attack surface. File share permissions, SharePoint access, and local admin rights on workstations are the most common offenders.
The Budget Reality
A significant portion of the Zero Trust journey can be completed using tools already included in M365 Business Premium or E3 licensing — Conditional Access, Intune basics, Defender for Endpoint, and Entra ID features. The more advanced capabilities (Defender XDR, PIM, advanced identity protection) require higher license tiers or add-ons. Prioritize MFA, device compliance, and network segmentation first — these three steps alone will dramatically improve your security posture without new budget.